대한기계학회논문집A (Transactions of the Korean Society of Mechanical Engineers A)

  • 제35권10호
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  • Pages.1155-1160
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  • 2011
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  • 1226-4873(pISSN)
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  • 2288-5226(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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열 노출에 의한 IN738LC의 기계적 특성 및 미세조직 변화

Mechanical Properties and Changes in Microstructure for IN738LC with Thermal Exposure

  • 윤용근 (충남대학교 기계설계공학과) ;
  • 김재훈 (충남대학교 기계설계공학과) ;
  • 정동희 (충남대학교 기계설계공학과) ;
  • 유근봉 (한전 전력연구원)
  • Yoon, Yong-Keun (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.) ;
  • Kim, Jae-Hoon (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.) ;
  • Jeong, Dong-Hee (Dept. of Mechanical Design Engineering, Chungnam Nat'l Univ.) ;
  • Yoo, Keun-Bong (Korea Electric Power Research Institute)
  • 투고 : 2010.12.13
  • 심사 : 2011.07.21
  • 발행 : 2011.10.01
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초록

니켈기 초내열합금은 높은 강도, 피로 및 산화 저항성이 우수하여 비행기 엔진, 선박 엔진 및 발전용 가스터빈 고온 부품 등을 만드는 소재로 오래전부터 사용되어 왔다. 본 연구에서는 가스터빈 블레이드 소재인 니켈기 초내열합금 IN738LC에 대하여 실제 운전환경과 유사한 조건을 설정하여 다양한 변형률 범위와 온도에서 인장시험을 수행하였다. IN738LC 소재를 $871^{\circ}C$ 및 $982^{\circ}C$에서 각각 1,000 ~ 10,000 시간 동안 열 노출한 시편을 준비하여 기계적 특성 및 미세조직 변화를 관찰하였다. 기계적 특성 변화는 열 노출 시간에 따른 ${\gamma}$의 변화와 관련된 것을 확인하였다.

High-strength nickel-based super alloys have been widely used in aircraft engines, vessel engines, and turbine blades because of their high strength and excellent fatigue and oxidation resistance. In this study, tests were carried out to determine the total strain range and temperature for high-strength nickel-based super alloys. Prepared specimens of IN738LC were exposed to temperatures of $871^{\circ}C$ and $982^{\circ}C$ for 1,000.10,000 h. These specimens were subjected to tests of mechanical properties and microstructure observations. The changes in mechanical properties were related to changes in ${\gamma}$ according to the thermal exposure time.

키워드

참고문헌

  1. Hwang, K. T., Kim, J. H., Yoo, K. B., Lee, H. S. and Yoo, Y. S., 2010, "Low Cycle Fatigue Behavior of Ni-Base Superalloy In738LC at Elevated Temperature," 2010 Spring Annual Meeting of KSME, pp.77-83.
  2. Kim, D. S., Yang, K. M. and Kim, K. M., 1999, "Oxidation and Sulfidation Behavior of IN738 and IN738LC at High Temperature," 1999 Fall Annual meeting of KISE, pp. 43-44.
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  5. 2009, "Standard Test Methods for Elevated Temperature Tension Tests of Metallic Materials," pp. 1-8
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  8. Roy, I., 2002, "Precipitate Growth Features in the Duplex Size ${\gamma}'$ Distribution in the Superalloy IN738LC," 2002 ME Graduate Student Conference.